devel/zmq: Move to net/libzmq2 & update to align with other ZeroMQ ports
All other core ZeroMQ library ports have been moved to the net/ category
along with the czmq client library. This change completes the set,
enabling greater flexibility and choice for maintainers of ZeroMQ-based
software in the ports tree.
- Move devel/zmq to net/libzmq2
- Update devel/ and net/ category Makefiles
- Add MOVED entry
- Update LIB_DEPENDS in dependent ports
net/libzmq2:
- Switch primary category to net